I just took a "plain" GWX, and got this:
they are 1.2 kilometers here, but the Flower has been shooting since the mission started with them about 2.2 apart. When I raised my scope and locked on them, when they got to 3800m, I surfaced, and they then turned their attention to me almost immediately. However, they never got close to hitting the VIIC until within maybe 3km, and then had their first hit on me at 2.8km. The next hit and they were down to 2.4, chasing me at top speed while I was standing still... lol - I could not man the deck gun, with waves washing over the boat a bit too much to be able to stay at the station... We were not broadside to the Flower initially. I'll move a bit further out for another run.